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Finding the Fourth Proportional to 18,712.32, 28,068.80 and 4,860.80

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Solution

The fourth proportional to 18,712.32, 28,068.80 and 4,860.80 is: 7,291.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.32 : 28,068.80 = 4,860.80 : x
  2. Step 2: Convert to fraction form
    18,712.32/28,068.80 = 4,860.80/x
  3. Step 3: Cross multiply
    18,712.32x = 28,068.80 × 4,860.80
  4. Step 4: Simplify right side
    18,712.32x = 136,436,823.04
  5. Step 5: Solve for x
    x = 136,436,823.04/18,712.32
  6. Step 6: Final answer
    x = 7,291.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.